What should my pressure be? Make Model Spec 166. 17 OPT166. 2.0I TWIN SPARK166. 2.0I TWIN SPARK. TURISMO166. 2.4 JTD166. 3.0 V6 24V. 17 OPT166. 3.0 V6 24V. 18 OPT166. 3.0 V6 24V. BASE